Effect of residual stresses induced by cold expansion on the crack growth in 6082 aluminum alloy

Semari, Zahar; Aid, A.; Benhamena, Ali; Amrouche, Abdelwaheb; Benguediab, M.; Sadok, Ahmed Hadj; Benseddiq, Noureddine

doi:10.1016/j.engfracmech.2012.12.003

Cited by 38 publications

(16 citation statements)

References 24 publications

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“…Regarding the degree of expansion, we notice that it had an important effect on the compressive residual stresses zone. These results are in agreement with the results of A.AMROUCHE and M. SU [32,31] who found that the degree of expansion has a significant influence on CRSZ. Also, the authors had shown, based on experimental measurements and finite element numerical calculations study that the growth of CRSZ stops at Ce = 5%.…”

Section: Analysis Of the Resultssupporting

confidence: 93%

“…It had been demonstrated that the mechanical characteristics have an influence on the distribution of the circumferential residual stresses. Several investigations carried by Z. SEMARI and M. SU [29][30][31] have focused on the study of the effect of the mechanical characteristics on residual stress profiles. Therefore all studies agree that the increasing of the yield strength causes a decrease in CRSZ.…”

Section: Analysis Of the Resultsmentioning

confidence: 99%

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Prediction and optimizing residual stress profile induced by cold expansion in aluminum alloys using experimental design

Miloudi¹,

Laredj

Lousdad

et al. 2019

Frattura Ed Integrità Strutturale

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Cold expansion by hardening is a common process used in the aerospace industry to extend the fatigue lifetime of drilled assemblies due to the existence of a field of high compressive tangential residual stresses. The understanding and the control of the residual stresses are thus important, since it can be beneficial to improve the reliability and lifetime of the structures. The main objective of this work is to establish and validate a predictive model of residual stresses generated by cold hardening. This technique will be useful for industrial application since it allows the estimation of the fatigue lifetime of parts with respect to the process parameters. This tool can also be used to determine the optimal parameters in order to maximize the fatigue lifespan. An experimental setup was used to highlight the effect of the expansion degree, the thickness of the part and the yield strength on the residual stresse profiles. Moreover, the proposed mathematical models are used to determine the optimal values of the process parameters and predict the residual stress in order to achieve a maximum service life of cracked structure after repair. Also it aims to delay crack initiation and growth in riveted or bolted structures. Moreover, the modelling allows to highlighting the effect of these factors and their interactions on the residual stresses profiles.

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Section: Analysis Of the Resultssupporting

confidence: 93%

Section: Analysis Of the Resultsmentioning

confidence: 99%

Prediction and optimizing residual stress profile induced by cold expansion in aluminum alloys using experimental design

Miloudi¹,

Laredj

Lousdad

et al. 2019

Frattura Ed Integrità Strutturale

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“…The initiation lives are predicted for crack initiation length equal to 0.5 mm. Others researchers have taken the initiation of the crack is equivalent to 10 5 cycles [6,[49][50][51]. It is noticed from Fig.…”

Section: Influence Of Compressive Residual Stress On Fatigue Crack Inmentioning

confidence: 99%

“…In fastened joints is necessary to improve the quality of holes by introducing compressive residuals stresses. The method to introduce the compressive residuals stress are such as shot peening [2,3] laser shock [4,5], and cold expansion [6][7][8][9]. P Fatigue phenomenon undergoes several stages and from an engineering point of view it is convenient to divide the fatigue life of a structure into three stages [10]: fatigue crack initiation, stable of crack growth and unstable crack growth.…”

Section: Introductionmentioning

confidence: 99%

“…As for the increase in fatigue amelioration of hole with cold expansion process, Liu et al [32] reported that, the fatigue life was improved by a factor from 1.5 to 5.0 witch depend on the expansion level. Also, in work of Semari et al [6], the effects of residuals stresses induced by ball in cold expansion process on fatigue life of 6082 T6 are given by experimentally and numerically investigation (3D finite element analysis). Improvement in fatigue life by expansion was shown under increasing of degree of expansion.…”

Section: Introductionmentioning

confidence: 99%

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Effect of cold expansion on improving of fatigue initiation life in Aluminium alloy

Habiri

Benachour

2018

Frattura Ed Integrità Strutturale

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In this paper, numerical investigation was carried out to quantify the effect of the cold expansion on fatigue crack initiation in Aluminium alloy. The improvement in fatigue initiation life of specimen after the cold expansion process was investigated with the drilled hole of 2024 T351 Aluminium alloy plate. The applied degree of expansion (DCE%=100 (Dd)/d) is 4.6% where the effect of friction (µ=0.2) is considered. Residual stress field is determined using 3D Finite Element Analysis and shows the presence of compressive residual stress around the hole. The results showed a high compressive residual stress near the hole in exit face of the hole and at middle of the plate thickness around the hole. Local strain approach is applied in evaluation of fatigue initiation lives under Afgrow environment code. Fatigue initiation lives are improved by the presence of the compressive residual stresses comparatively to the drilled hole without of compressive residual stresses. Also, the fatigue initiation lives are increased with the increase in stress ratio for drilled hole and expanded hole Citation: El Habiri, Med., Benachour, M., Benachour, N., Effect of cold expansion on improving of fatigue initiation life of Aluminium alloy, Frattura ed Integrità Strutturale, 46 (2018) 34-44.

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Finite Element Simulation of Fatigue Damage Accumulation for Repaired Component by Cold Expansion Method

Aid

Bendouba

Benguediab

et al. 2015

Applied Condition Monitoring

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Effect of residual stresses induced by cold expansion on the crack growth in 6082 aluminum alloy

Cited by 38 publications

References 24 publications

Prediction and optimizing residual stress profile induced by cold expansion in aluminum alloys using experimental design

Prediction and optimizing residual stress profile induced by cold expansion in aluminum alloys using experimental design

Effect of cold expansion on improving of fatigue initiation life in Aluminium alloy

Finite Element Simulation of Fatigue Damage Accumulation for Repaired Component by Cold Expansion Method

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